Henry Gray (18251861). Anatomy of the Human Body. 1918.
part of the articular cavity in which it is received. The dorsal surface of the ligament presents a fibrocartilaginous facet, lined by the synovial membrane, and upon this a portion of the head of the talus rests. Its plantar surface is supported by the tendon of the Tibialis posterior; its medial border is blended with the forepart of the deltoid ligament of the ankle-joint.
FIG. 359 Talocalcaneal and talocalcaneonavicular articulations exposed from above by removing the talus. (See enlarged image)
The plantar calcaneonavicular ligament, by supporting the head of the talus, is principally concerned in maintaining the arch of the foot. When it yields, the head of the talus is pressed downward, medialward, and forward by the weight of the body, and the foot becomes flattened, expanded, and turned lateralward, and exhibits the condition known as flat-foot. This ligament contains a considerable amount of elastic fibers, so as to give elasticity to the arch and spring to the foot; hence it is sometimes called the spring ligament. It is supported, on its plantar surface, by the tendon of the Tibialis posterior, which spreads out at its insertion into a number of fasciculi, to be attached to most of the tarsal and metatarsal bones. This prevents undue stretching of the ligament, and is a protection against the occurrence of flat-foot; hence muscular weakness is, in most cases, the primary cause of the deformity.
Cuneonavicular Articulation (articulatio cuneonavicularis; articulation of the navicular with the cuneiform bones).The navicular is connected to the three cuneiform bones by dorsal and plantar ligaments.
The Dorsal Ligaments (ligamenta navicularicuneiformia dorsalia).The dorsal ligaments are three small bundles, one attached to each of the cuneiform bones. The bundle connecting the navicular with the first cuneiform is continuous around the medial side of the articulation with the plantar ligament which unites these two bones (Figs. 354, 355).
The Plantar Ligaments (ligamenta navicularicuneiformia plantaria).The plantar ligaments have a similar arrangement to the dorsal, and are strengthened by slips from the tendon of the Tibialis posterior (Fig. 358).
Synovial Membrane.The synovial membrane of these joints is part of the great tarsal synovial membrane (Fig. 360).
Movements.Mere gliding movements are permitted between the navicular and cuneiform bones.
Cuboideonavicular Articulation.The navicular bone is connected with the cuboid by dorsal, plantar, and interosseous ligaments.